jeepster90xj

thanks cruiser i will do this tomorrow and see how it goes and i will let you all now thanks

jeepster90xj

okay so i finally got around to doing that and it didnt seem to change a whole lot. it did help with the jumping around at 1500 rpm's but it still stutters a lot when i take off unless i really put my foot into it.

cruiser54

What all did you do exactly?

jeepster90xj

well i started opening up the wiring like your write up said to do but could only find 1 connection point where i had 5 brown wires with a white stripe that went into 1 brown wire with a white stripe so i cut that connection out and re did that... i never found the second connection...

cruiser54

Not even over near the MAP sensor?

jeepster90xj

okay i went and looked up where the map sensor was.. haha the connection i found was by in the big bundle of wires that the map sensor wires go into... the connection i re did was towards the passenger side from the map sensor... it had 5 brown with white stripe wires going into 1 brown with white stripe wire... does that sound correct???

cruiser54

Yes. My instructions came about when I did an 87 and 88 Renix Jeep. The 89 and 90 had no C101 connector and the wiring changed a bit.

More importantly, what's the resistance value now when wiggling the harness like in the initial test?

jeepster90xj

alright i just re did the initial test and when it sits there it is at 0 and when i wiggle it around it either doesnt change or the reading never goes above .5 ohms

cruiser54

You're good to go then.

jeepster90xj

okay sweet but that didnt fix the problem haha was that supposed to fix the problem?

cruiser54

Could have. Now we know it's not that and it won't rear it's ugly head in the future.

jeepster90xj

oh okay so where do i go from here? any other ideas?

cruiser54

Which instructions did you use when adjusting the TPS? Mine or some other ones?

jeepster90xj

not sure on which i used if you could post yours i can go test it and re adjust it if needed
EDIT: i actually just looked up and found your procedure and re tested the tps and it is adjusted to your write up.

cruiser54

RENIX TPS ADJUSTMENT
Before attempting to adjust your TPS be sure the throttle body has been recently cleaned. It's especially important that the edges of the throttle butterfly are free of any carbon build-up.
IMPORTANT NOTE: With the Key OFF, and using the positive (red) lead of your ohmmeter, probe the B terminal of the flat 3 wire connector of the TPS. The letters are embossed on the connector itself. Touch the black lead of your meter to the negative battery post. Wiggle the wiring harness where it parallels the valve cover and also over near the MAP sensor on the firewall. If you see more than 1 ohm of resistance, or fluctuation in your ohms reading, some modifications to the sensor ground harness will be necessary. The harness repair must be performed before proceeding. I can provide an instruction sheet for that if needed.
MANUAL TRANSMISSION:
RENIX manual transmission equipped XJs have only a flat three-wire TPS mounted on the throttle bodyand it provides data input to the ECU. It has three wires in the connector and they're clearly embossed with the letters A, B, and C. Wire "A" is positive. Wire "B" is ground. Key ON, measure voltage from "A" positive to "B" ground by back-probing the connectors. Note the voltage reading--this is your REFERENCE voltage. Key ON, back-probe the connector at wires "B" and "C". Measure the voltage. This is your OUTPUT voltage. Your OUTPUT voltage needs to be seventeen percent of your REFERENCE voltage. For example: 4.82 volts X .17=.82 volts. Loosen both T-20 Torx screws attaching the TPS to the throttle body and rotate the TPS until you
have achieved your desired output voltage. Tighten the screws carefully while watching to see that your output voltage remains where it is supposed to be. If you can't achieve the correct output voltage, replace the TPS and start over.
Sometimes, after adjusting your TPS the way outlined above, you may experience a high idle upon starting. If that happens, shut the engine off and reconnect your probes to B and C. Start the engine and while watching your meter, turn the TPS clockwise until the idle drops to normal and then rotate it back counterclockwise to your desired output voltage.
AUTOMATIC TRANSMISSION: RENIX automatic transmission equipped XJs have a TPS with two connectors. There is a flat three-wire connector, same as the manual transmission vehicles have, and it is tested the same as the manual transmission equipped vehicles, as outlined above—FOR ALL ENGINE MANAGEMENT RELATED ISSUES.
However, the automatic TPS also has a square four-wire connector, clearly embossed with the letters A,B,C, and D. It only uses three wires and provides information to the Transmission Control Module. THIS SQUARE FOUR WIRE CONNECTOR IS USED FOR TRANSMISSION/SHIFTING RELATED ISSUES ONLY. Key ON, measure voltage between "A" positive and "D" ground. Note the voltage. This is your REFERENCE voltage. Back-probe the connector at wires "B" and "D". Measure the voltage. This is your OUTPUT voltage. Your OUTPUT voltage needs to be eighty-three percent of your REFERENCE voltage. For example 4.8 volts X .83=3.98 volts. Adjust the TPS until you have achieved this percentage. If you can't, replace the TPS and start over. So, if you have an automatic equipped XJ your TPS has two sides--one side feeds the ECU, and the other side feeds the TCU.
FOR AUTOMATIC TRANSMISSION RELATED ISSUES: Check the square four-wire connector side of the TPS.
If you have ENGINE ISSUES check the flat three-wire connector side of the TPS.
For those with a MANUAL TRANSMISSION--the TPS for the manual transmission XJs is stupid expensive. You can substitute the automatic transmission TPS which is reasonably priced.
Revised 09-22-2012